It really doesn't sound like ChatGPT’s default voice, though it is pretty good at taking on different voices so in a sense you could say that about almost anything. It does use em-dashes, which people have recently started way over-indexing on as a ChatGPT tell, but lots of posters on HN have been using em-dashes for longer than ChatGPT has existed.

It does read like marketing material, though.

It does, and it muddies the waters a lot. Why does it read like a sales pitch?

ChatGPT learned that voice from actual people, you know.